How was the invention of the wheel important to the sumerians? a. it allowed them to conquer neighboring states. b. it made traveling with traded items easier and increased trade. c. it improved their communication and recordkeeping. d. it them to water their crops all year.

The directory was unsuccessful and was eventually replaced because no constitution had been created that outlined its authority. it was connected with the reign of terror. its members did not get along with napoleon. the national convention did not agree with the directory's decisions.